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在材料色散为零的1.3μm 波长区,实现低损耗宽带宽的渐变型光纤是当前要达到的目标。在本文中,为了确立1.3μm 波长区用的渐变型光纤的制造技术,进行了组分的探讨,以及折射率分布控制法的改善、最佳折射率分布系数的探讨等。结果,弄清了纤芯组分以 GeO_2—P_2O_5—SiO_2系,包层组分以 GeO_2—B_2O_3—P_2O_5—SiO_2系为宜,波长在1.27μm 时的最佳折射率分布系数为1.88±0.01。而就所内传输实验(TL_3)而言,制作了11根预制件,并拉制成21.4公里长,得到平均损耗为0.70分贝/公里(在1.3μm 下),平均带宽为1080兆耕·公里(在1.27μm 下)的1.3μm 波长用渐变型光纤。此外,还制造成了1.27μm 下为2.1千兆赫·公里,1.06μm 下为3.5千兆赫·公里的超宽带渐变型光纤。
In the 1.3 μm wavelength region where the material dispersion is zero, a tapered optical fiber with low loss and wide bandwidth is the target to be achieved at present. In this paper, in order to establish the manufacturing technology of the tapered optical fiber for 1.3μm wavelength region, the components are discussed, and the improvement of the refractive index distribution control method and the discussion of the best refractive index distribution coefficient are also discussed. As a result, it is clear that the core component is GeO_2-P_2O_5-SiO_2 and the cladding component is GeO_2-B_2O_3-P_2O_5-SiO_2. The optimum refractive index distribution coefficient is 1.88 ± 0.01 when the wavelength is 1.27μm. For the in-flight transmission experiment (TL_3), eleven preforms were produced and drawn to 21.4 km length, resulting in an average loss of 0.70 dB / km (at 1.3 μm) with an average bandwidth of 1080 MBs per km At 1.27 μm) for a 1.3 μm wavelength graded fiber. In addition, ultra-wideband graded fibers of 2.1 gigahertz at 1.27 m and 3.5 gigahertz at 1.06 m were also fabricated.